It's not possible to watch an individual attachment. I've also searched in the Atlassian Marketplace for add-ons that may do this, and haven't found any.
As an alternative, you could add a label to the attachment, and then build an RSS feed that returns results for all attachments with that label.
See the docs on building an RSS feed: https://confluence.atlassian.com/display/DOC/Using+the+RSS+Feed+Builder
I haven't tried it, but it should work. Let us know how it goes. :)
Thank you, Sarah. The RSS idea might be useful for general tracking, but I am not sure it would provide the type of alerts we are looking for if an attachment is updated or changed. Even if we sorted by recently updated, it would be a passive mechanism rather than an active one with an alert. But we'll give it a whirl.
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